/**********************************************************   模塊名稱:       Camera.cpp   目的:        提供攝影機的操作,俯仰,平移,前進,后退,傾斜,旋轉等;   作者:        潘李亮 HeartBlue		       XpertSoft HeartBlue 2002/9/26			   Allright reserved			   版權所有 

//全是數學運算…^_^
**********************************************************/#include "CommGLHeader.h"#include "FreeCamera.h"void CFreeCamera::SetUpDir(float x,float y,float z){   MVECTOR v={x,y,z};   Math.Normalize(v);
   m_info.up.x  = v.x;    m_info.up.y  = v.y;   m_info.up.z  = v.z;
}void CFreeCamera::SetCameraPos(float x,float y,float z){	m_info.pos.x =x;
	m_info.pos.y =y;
	m_info.pos.z =z;}void CFreeCamera::SetTarget(float x,float y,float z){	m_info.target.x = x; 
	m_info.target.y = y;	m_info.target.z = z;}//使用攝影機void CFreeCamera::Look(){//	MVECTOR d = {   m_info.target.x - m_info.pos.x,  
//					m_info.target.y - m_info.pos.y,  
//					m_info.target.z - m_info.pos.z,  
//					m_info.target.w - m_info.pos.w
//	};
//	float len = Math.LenVector(d);
//	float dx = m_zoom_info.fdist * d.x /len;
//	float dy = m_zoom_info.fdist * d.y /len;
//	float dz = m_zoom_info.fdist * d.z /len;
	gluLookAt(
		       m_info.pos.x,    m_info.pos.y,     m_info.pos.z,          //觀察者的位置
		       m_info.target.x, m_info.target.y,  m_info.target.z, //視點的中心
			   m_info.up.x,     m_info.up.y,      m_info.up.z               //上方的位置
			 );}//俯仰角度void CFreeCamera::Raise(float theta){	MVECTOR vdir= {m_info.target.x - m_info.pos.x, m_info.target.y-m_info.pos.y,m_info.target.z-m_info.pos.z};	MVECTOR vn;	
	float m=Math.LenVector(vdir);	Math.Normalize(vdir);	//得到另外一條觀察平面的 坐標軸方向	Math.CrossNormal(vdir,m_info.up,vn);	    //向上位置先旋轉	Math.Rotate(vn,m_info.up,theta);    //旋轉視線方向    Math.Rotate(vn,vdir,theta);
    m_info.target.x = m_info.pos.x + vdir.x*m;	m_info.target.y = m_info.pos.y + vdir.y*m; 	m_info.target.z = m_info.pos.z + vdir.z*m;     }//旋轉void CFreeCamera::Turn(float theta){   	MVECTOR vdir = {m_info.target.x-m_info.pos.x,m_info.target.y-m_info.pos.y,m_info.target.z-m_info.pos.z};	float m=Math.LenVector(vdir);	Math.Normalize(vdir);	Math.Rotate(m_info.up,vdir,theta);	m_info.target.x = m_info.pos.x+vdir.x*m;	m_info.target.y = m_info.pos.y+vdir.y*m; 	m_info.target.z = m_info.pos.z+vdir.z*m; 

	m_info.vdir = m_info.target - m_info.pos;
	m_info.vup  = m_info.up ;}//繞行void CFreeCamera::Circle(float theta){   	MVECTOR vdir = {m_info.pos.x-m_info.target.x,m_info.pos.y-m_info.target.y,m_info.pos.z-m_info.target.z};	float m = Math.LenVector(vdir);	Math.Normalize(vdir);	Math.Rotate(m_info.up,vdir,theta);	m_info.pos.x = m_info.target.x+vdir.x * m;	m_info.pos.y = m_info.target.y+vdir.y * m; 	m_info.pos.z = m_info.target.z+vdir.z * m; 

	m_info.vdir = m_info.target - m_info.pos;
	m_info.vup  = m_info.up ;}//傾斜void CFreeCamera::Lean(float theta){	MVECTOR  vdir={m_info.target.x-m_info.pos.x,m_info.target.y-m_info.pos.y,m_info.target.z-m_info.pos.z};	float m=Math.LenVector(vdir);	Math.Normalize(vdir);	Math.Rotate(vdir,m_info.up,theta); 

	m_info.vdir = m_info.target - m_info.pos;
	m_info.vup  = m_info.up ;}//向前向后運動void CFreeCamera::Forward(float dist){    MVECTOR  vdir = {m_info.target.x-m_info.pos.x,m_info.target.y-m_info.pos.y,m_info.target.z-m_info.pos.z};	float m  =  Math.LenVector(vdir);    float dx = dist*vdir.x/m;	float dy = dist*vdir.y/m;	float dz = dist*vdir.z/m;    m_info.target.x += dx;	m_info.target.y += dy;	m_info.target.z += dz;	m_info.pos.x += dx;	m_info.pos.y += dy;	m_info.pos.z += dz;	}//左右平移void CFreeCamera::Shift(float dist){	MVECTOR vdir={m_info.target.x-m_info.pos.x,m_info.target.y-m_info.pos.y,m_info.target.z-m_info.pos.z};	MVECTOR vx;	Math.Normalize(vdir);	Math.CrossNormal(vdir,m_info.up,vx);		float m=Math.LenVector(vx);    float dx=dist*vx.x/m;	float dy=dist*vx.y/m;	float dz=dist*vx.z/m;    m_info.target.x+=dx;	m_info.target.y+=dy;	m_info.target.z+=dz;	m_info.pos.x+=dx;	m_info.pos.y+=dy;	m_info.pos.z+=dz;}void CFreeCamera::Up(float dist){   float dx=dist*m_info.up.x;    float dy=dist*m_info.up.y;    float dz=dist*m_info.up.z;    m_info.target.x+=dx;    m_info.target.y+=dy;    m_info.target.z+=dz;    m_info.pos.x += dx;    m_info.pos.y += dy;    m_info.pos.z += dz;}
void CFreeCamera::ReLocate(float x,float y,float z){    MVECTOR vdir = {m_info.target.x-m_info.pos.x,m_info.target.y-m_info.pos.y,m_info.target.z-m_info.pos.z};    m_info.pos.x = x;	m_info.pos.y = y;	m_info.pos.z = z;	m_info.target.x=x+vdir.x; 	m_info.target.y=y+vdir.y; 	m_info.target.z=z+vdir.z; }
CFreeCamera::CFreeCamera()
{
	this->m_zoom_info.factor = 1;
	this->m_zoom_info.zoom_angle =0;
	this->m_info.vangle =0; 
     
	m_info.near_dist = 0.01;
	m_info.pos.z = m_info.pos.y =m_info.pos.x = 0;
	m_info.target.x = m_info.target.z =0;
	m_info.target.y = 10;

	m_info.up.x =m_info.up.y = 0;
	m_info.up.z = 1.0;
	
	m_info.vdir.x = m_info.vdir.z = 0;
	m_info.vdir.y = 1.0;
	
	m_info.vup.x = m_info.up.x ; 
	m_info.vup.y = m_info.up.y ;
	m_info.vup.z = m_info.up.z ;
}
void  CFreeCamera::ZoomedProject(float factor)
{
	glMatrixMode(GL_PROJECTION);
	glLoadIdentity();
    gluPerspective(this->m_zoom_info.zoom_angle,factor,0.1,m_info.far_dist *ZOOM_LOD_F*(m_info.vangle/m_zoom_info.zoom_angle));
	glMatrixMode(GL_MODELVIEW);
//	glLoadIdentity();
}
void  CFreeCamera::Project(float factor)
{
	if(IsZoomed())
	  ZoomedProject(factor);
	else
	{
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		gluPerspective(this->m_info.vangle,factor,0.1,m_info.far_dist );
		glMatrixMode(GL_MODELVIEW);
	}
}